#ifndef __UDP_SERVER_HPP__
#define __UDP_SERVER_HPP__

#include <iostream>
#include <string>
#include <memory>
#include <functional>
#include <cstring>
#include <cerrno>
#include <string.h>

#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <functional>

#include "InetAddr.hpp"
#include "Log.hpp"
#include "Common.hpp"
#include "ThreadPool.hpp"

using namespace LogModule;
using namespace ThreadPoolModule;

const static int gsockfd = -1;
// const static std::string gdefaultip = "127.0.0.1";      // 表示本地主机
const static uint16_t gdefaultport = 8080;

using adduser_t = std::function<void(InetAddr &id)>;
using remove_t = std::function<void(InetAddr &id)>;

using task_t = std::function<void()>;
using route_t = std::function<void(int sockfd, const std::string &message)>;

// 编程技巧 继承nocopy的类就都不会被拷贝了
class nocopy
{
public:
    nocopy() {}
    nocopy(const nocopy &) = delete;
    const nocopy &operator=(const nocopy &) = delete;
    ~nocopy() {}
};

class UdpServer : public nocopy
{
public:
    UdpServer(uint16_t port = gdefaultport)
        : _sockfd(gsockfd), _addr(port), _isrunning(false)
    {
    }

    // 都是套路
    void InitServer()
    {
        // 1. 创建socket
        _sockfd = ::socket(AF_INET, SOCK_DGRAM, 0); // IP?PORT?网络？本地？
        if (_sockfd < 0)
        {
            LOG(LogLevel::FATAL) << "socket: " << strerror(errno);
            Die(SOCKET_ERR);
        }
        LOG(LogLevel::INFO) << "socket success, sockfd is : " << _sockfd;

        int n = ::bind(_sockfd, _addr.NetAddr(), _addr.NetAddrLen());
        if (n < 0)
        {
            LOG(LogLevel::FATAL) << "bind: " << strerror(errno);
            Die(BIND_ERR);
        }
        LOG(LogLevel::INFO) << "bind success";
    }

    void RegisterService(adduser_t adduser, route_t route, remove_t removeuser)
    {
        _adduser = adduser;
        _route = route;
        _removeuser = removeuser;
    }

    void Start()
    {
        _isrunning = true;
        while (true)
        {
            char inbuffer[4096];
            struct sockaddr_in peer;
            socklen_t len = sizeof(peer); // 必须设置

            ssize_t n = ::recvfrom(_sockfd, inbuffer, sizeof(inbuffer) - 1, 0, CONV(&peer), &len);
            if (n > 0)
            {
                InetAddr cli(peer);
                inbuffer[n] = 0;
                std::string message;
                if (strcmp(inbuffer, "QUIT") == 0)
                {
                    // 移除观察者
                    _removeuser(cli);
                    message = cli.Addr() + "# " + "我走了， 你们聊!";
                }
                else
                {
                    // 2. 新增用户
                    _adduser(cli);
                    message = cli.Addr() + "# " + inbuffer;
                }

                // task_t task = [this, message]()
                // {
                //     this->_route(this->_sockfd, message);
                // };

                // 3. 构建转发任务，推送给线程池，让线程池进行转发  线程池是无参数的所以要绑定
                task_t task = std::bind(UdpServer::_route, _sockfd, message);
                ThreadPool<task_t>::getInstance()->Equeue(task);

                // std::string echo_string = "echo# ";
                // echo_string += inbuffer;

                // ::sendto(_sockfd, echo_string.c_str(), echo_string.size(), 0, CONV(&peer), sizeof(peer));
            }
        }
        _isrunning = false;
    }

    ~UdpServer()
    {
        if (_sockfd > gsockfd)
            ::close(_sockfd);
    }

private:
    int _sockfd;
    InetAddr _addr;
    bool _isrunning; // 服务器运行状态

    // 新增用户
    adduser_t _adduser;
    // 移除用户
    remove_t _removeuser;
    // 数据转发
    route_t _route;
};

#endif
